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/*
* Copyright (C) 2004, 2008, 2009 Apple Inc. All rights reserved.
* Copyright (C) 2008 Collabora Ltd.
* Copyright (C) 2011 Peter Varga (pvarga@webkit.org), University of Szeged
* Copyright (C) 2013 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "bindings/v8/ScriptRegexp.h"
#include "bindings/v8/V8Binding.h"
#include "bindings/v8/V8PerIsolateData.h"
#include "bindings/v8/V8RecursionScope.h"
namespace WebCore {
ScriptRegexp::ScriptRegexp(const String& pattern, TextCaseSensitivity caseSensitivity, MultilineMode multilineMode)
{
v8::Isolate* isolate = v8::Isolate::GetCurrent();
v8::HandleScope handleScope(isolate);
v8::Local<v8::Context> context = V8PerIsolateData::from(isolate)->ensureRegexContext();
v8::Context::Scope scope(context);
unsigned flags = v8::RegExp::kNone;
if (caseSensitivity == TextCaseInsensitive)
flags |= v8::RegExp::kIgnoreCase;
if (multilineMode == MultilineEnabled)
flags |= v8::RegExp::kMultiline;
v8::TryCatch tryCatch;
v8::Local<v8::RegExp> regex = v8::RegExp::New(v8String(context->GetIsolate(), pattern), static_cast<v8::RegExp::Flags>(flags));
// If the regex failed to compile we'll get an empty handle.
if (!regex.IsEmpty())
m_regex.set(isolate, regex);
}
int ScriptRegexp::match(const String& string, int startFrom, int* matchLength) const
{
if (matchLength)
*matchLength = 0;
if (m_regex.isEmpty() || string.isNull())
return -1;
// v8 strings are limited to int.
if (string.length() > INT_MAX)
return -1;
v8::Isolate* isolate = v8::Isolate::GetCurrent();
v8::HandleScope handleScope(isolate);
v8::Local<v8::Context> context = V8PerIsolateData::current()->ensureRegexContext();
v8::Context::Scope scope(context);
v8::TryCatch tryCatch;
V8RecursionScope::MicrotaskSuppression microtaskScope;
v8::Local<v8::RegExp> regex = m_regex.newLocal(isolate);
v8::Local<v8::Function> exec = regex->Get(v8AtomicString(isolate, "exec")).As<v8::Function>();
v8::Handle<v8::Value> argv[] = { v8String(context->GetIsolate(), string.substring(startFrom)) };
v8::Local<v8::Value> returnValue = exec->Call(regex, 1, argv);
// RegExp#exec returns null if there's no match, otherwise it returns an
// Array of strings with the first being the whole match string and others
// being subgroups. The Array also has some random properties tacked on like
// "index" which is the offset of the match.
//
// https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/RegExp/exec
if (!returnValue->IsArray())
return -1;
v8::Local<v8::Array> result = returnValue.As<v8::Array>();
int matchOffset = result->Get(v8AtomicString(isolate, "index"))->ToInt32()->Value();
if (matchLength) {
v8::Local<v8::String> match = result->Get(0).As<v8::String>();
*matchLength = match->Length();
}
return matchOffset + startFrom;
}
} // namespace WebCore
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